Post the final OS update by a full year we're in a declining phase of the OS, where most of the stuff that ever worked still works (and is supported), but things are definitely now falling off the edges, as it were. Which means that it's hard to keep track of it all - hence the table below, which I'll keep updated every month.
Note that some dates are approximate, since even we at AAWP can't see into the future with certainty! I've colour coded table cells, with pale red for 'on the way out, with workarounds and caveats', through increasingly dark shades, and red for 'no hope!'...
|Security updates||The last update was in January 2020 - and was for the newest 1709 branch. Theoretically, the OS is now 'vulnerable', though in practice Windows 10 Mobile is now battle hardened and also an utterly miniscule target for attackers, so the lack of updates won't actually be an issue. I'd suggest that lack of support also means that people at Microsoft won't be testing services against Windows 10 Mobile any more, but we all know that they haven't been doing this for some time, sadly.|
|Firmware rebuilds||If something goes horribly wrong and you need a fresh start then there are a couple of PC-based utilities to help out (WDRT, OTC Updater), though they rely on the original phone 'images' being still available on Microsoft's servers. I can't imagine the download bandwidth here amounts to much, but Microsoft will, at some point, shut down these servers, probably because things are changing server-side to accommodate new services and platforms. No end date is known, I'd guess, some time in 2021 or beyond. They're all still working right now, at the end of December 2020.
If all else fails, sites like lumiafirmware.com appear to have archived all the device images from Microsoft's servers. Actually flashing them on is VERY non-trivial, so I'll save a tutorial for when the official utilities break!
|Web browsing (Edge)||Edge remains a competent browser for most plain sites. But its development stopped as of Windows 10 branch 1703 over two years ago, effectively, since the 1709 branch's Edge wasn't fully rounded out (in terms of service worker and other background operation). Which makes it something of a dead end if you're looking for more. Third party browsers like Monument Browser do more, though ultimately have the same underlying restrictions for PWAs and some other HTML5-reliant sites. Roughly half the PWAs out there work, roughly half don't - see the Flow column on AAWP for recommendations of the former!|
|Auto-backups||Until 'March 2020', i.e. over ten months ago! Clearly someone at Microsoft has forgotten to turn this service off*, which is handy. It's not clear whether manual backups will be possible after auto-backups do eventually finish. Watch this space - as of today, 30th December 2020, both auto and manual backups are still working just fine. I'll keep you posted!
* This syndrome isn't unknown. No one at Microsoft has been specifically tasked with shutting the server off so things will probably now just keep working until an infrastructure change for some other system physically impacts the backup servers!
|Restoring from backups||Until 'March 2021' - after this, if you hard reset a Windows 10 Mobile phone then you'd have to rebuild it manually, installing from the Store, etc. Which will still hopefully function. I'll post a tutorial and check list as and when this definitely stops working.|
|Store apps||Application updates and installs should be fine until at least the end of 2021. The old 8.1 Store was given 30 months after end of support for the OS itself, if we extrapolate that to Windows 10 Mobile then the Store might last until summer 2022. But I think the end might come the previous Christmas.
Notably, as you'll have seen from the slow down in software stories in 2020, the trickle of new UWP applications in the Store has now dried up completely, and only a handful of popular titles are still receiving updates. The developer world has (understandably) moved on. But it's still important to have the Store fully available, in case you have to reset and restore a Lumia, since latest binaries come from here as part of the restore process.
|Store client||Ignore scare stories about the Store client itself not being updated anymore - updates with bug fixes and security tweaks will continue for at least a year, possibly more, albeit with new features and UI fanciments only for Redstone 3 and above (i.e. on Desktop/Hololens, etc.) And yes, some of these updates will have knock on effects for Windows 10 Mobile - we had problems with the Store needing a manual 'Refresh' recently - these got resolved, thankfully.|
|Auto-Photos upload to OneDrive||Still working at the moment, though in theory next year (2021) you'd have to upload images manually, as needed. No doubt Microsoft will forget to actually switch this off too, so it will carry on through 2021 until something breaks! I'll report back if it breaks.
It's worth noting that the OneDrive client on iOS and Android is excellent - if you do switch at some point then you essentially carry on with the same interface, auto-backup, and photo stream in the cloud (subject to your storage plan, e.g. 1TB with Office 365)
|OneDrive music streaming||Stopped from May 2019 onwards, at least from within Groove Music app. You can still stream from OneDrive or download from both first and third party applications though - see the linked article for suggestions.|
|OneDrive||No cessation date for Windows 10 Mobile access announced, likely 2022 or way beyond - Microsoft is a cloud company in many ways now and OneDrive is central to its vision.|
This being a cloud-centric OCR solution, it's utterly dependent on Microsoft allowing server access. It has been announced that access to the OneDrive servers will stop at the end of 2020, and this has now happened, for Office Lens on both Mobile and Desktop. The idea is that the iOS and Android versions of Office include the same functionality and will be more convenient for most people. Go figure.
|Outlook Mail, Calendar
||No cessation date announced, likely 2022 or beyond. Outlook app development is all on newer Windows 10 branches though, so the current one on Windows 10 Mobile is only receiving small bug fixes and none of the sexier stuff you'll read about in the news.|
|Office UWP applications||Updates for these will finally stop in 'January 2021', i.e. in the next month, though the applications will carry on working indefinitely. The lack of updates after this is moot though, since main app development is all on newer Windows 10 branches, so the current Office UWP apps on Windows 10 Mobile have only been receiving bug fixes (at best).|
|Maps/Navigation||No official cessation date announced, likely 2022 or beyond. 'Automatically update maps' seems to still work as of 30 December 2020, but you can also 'check for updates' and pick up new maps manually, in 'Settings/Apps/Offline maps'. Worth doing every couple of months, I reckon, there's usually a new map update when I check on each test device - the last official update was just a few days ago.|
|News||No cessation date announced, likely 2022 or beyond. Functionality under Windows 10 Mobile has been frozen for a while, but it is still getting tweaks to encompass new news sources and options. Sadly, there are glitches on Mobile, including not saving one's sources/preferences in News.|
|Weather||As with News, no cessation date announced, likely 2022 or beyond, and everything still works just fine.|
|Microsoft To-Do||No cessation date announced, but application updates have now stopped on Mobile, with new features only appearing on higher Windows 10 branch numbers, for the Desktop. Compatibility with base (textual) To-do data is still full as at December 2020 and is likely through most of 2021.|
|Cortana||This has now been announced as ended, including on Android, by the way, so it's not just W10M suffering. On my Lumias, and in most regions, Cortana/search can't even connect to the Internet to perform a basic 'web search' now. Just forget Cortana ever existed. Sad.|
|Films & TV||(aka 'Movies & TV') No cessation date announced, but several rumours. Clever money has new purchases stopping soon and no access to past purchases stopping in 2020. Just a guess. I've checked and past purchases are still available, as at the end of December 2020, the DRM still works, encrypted movies and TV shows still play, and with no warning messages in-app.|
|Skype||No cessation date announced for the UWP app (the Desktop is now back to Win32, effectively), but it's 100% online and requires server integration, obviously, so I wouldn't be surprised if an end date (early in 2021?) for Skype on Windows 10 Mobile was announced soon. As at December 2020 it's still fully working, including syncing all messages and calls.|
|In theory, this will keep working for ages if it's already set up, since it relies on tokens from the relevant sites and time-based calculations. But sites might revoke tokens and require re-authentication, so a system like this isn't guaranteed forever. It'll be OK during 2020, though note that Microsoft Authenticator does more on iOS and Android, include token syncing between signed-in devices (in theory - in my experience, this is patchy, anyway). It's just a shame that this potential sync doesn't include W10M, since the app was frozen too early in development.|
|Official client is a PWA, but works very well, apart from lack of push notifications in Edge (the usual lack of 'service workers' in the browser). Here's the latest changelog. API limitations at Twitter's end mean that there's now no fully working third party alternative (at least, one that also has access to DMs).|
|Official (Osmeta-based, derived from iOS codebase) client has now been withdrawn from the Store, and even if you have it previously installed then it crashes and burns. There are numerous Facebook 'scraping' applications and options though, and these run faster and more efficiently than the Facebook original client ever did (go figure!)|
|Facebook Messenger||Official (Osmeta-based, derived from iOS codebase) client also now not available anymore. Good riddance, arguably, since it was bloated. The solutions linked in our article here include basic Messenger support, though.|
Official (Osmeta-based, derived from iOS codebase) client has now been withdrawn, being part of the Facebook 'empire'. There's an official Instagram PWA, but it's officially available patchily under Windows 10 Mobile, available as an upgrade through the Store only if you have the original installed. Very odd. But don't despair, as the PWA has been recently upgraded and is available to anyone as a simple URL/favourite in the Edge browser.
There are also several third party alternatives, the clear favourite of which is the quirky, often unstable, but always improving Winsta UWP (which now features notifications - of sorts!)
|The official WP8.1 client has now officially stopped working. If you need a Whatsapp replacement and don't want to switch platform then see Telegram, below.|
|Telegram||Plenty of options here, with an official WP8.1 application (still in the W10M Store) that is gradually falling into disrepair, but also an official PWA that works OK (though with no push notifications, due to Edge limitations) and a third party app, Unigram Mobile Messenger UWP, which is at least fully functional and available (after the original Unigram went off into Desktop-only realms).|
|Viber||This messaging app has a first party UWP application, but reviews have been patchy - it's not actively updated. According to readers, its functionality is now compromised.|
|Snapchat||This has never been on Windows phones and never will be.|
|There's no official client for this, but pinterest.com in Edge seems to be a PWA and acts like an application. Plus, if you still want a native UWP application experience, there's 'Piny - Pinterest with love' UWP|
The official WP8.1 application still technically runs, but has now lost search functions and is clearly on the way out. Various third party applications were targetted by Spotify's lawyers and have now been withdrawn from the Store, sadly. Spotimo UWP was your best bet, and was reworked as 'Strix Music', and this is available for side-loading. Not ideal, but its 'LTS' (Long Term Support) version (v1.4.9 as I write this) does 'kind of' work and it's not too onerous to get it installed. Expect glitches galore, so be patient with it - it's all we've got!
This official WP8.1 application has now stopped working on both 8.1 and also Windows 10 Mobile in most regions.
|Video||Amazon has never had an official Prime Video application for Windows phones, but if you're happy to fiddle a little in Edge then you can watch this on the go. It's not trivial though and is a complete pain in the proverbial compared to the slick experience in a dedicated app on other platforms. Interestingly, an official Prime Video application for Windows 10 Desktop appeared recently.|
|Audible||For audio books, the excellent Audible UWP application and Amazon's service continues to work well, as at the end of 2020.|
|Deezer||For general audio (radio, podcasts, some audio books), there's an official UWP client for Deezer, but it's starting to hit the rails. Some 'front page' content no longer loads and the Facebook login method no longer works, but I was able to log in via a dedicated Deezer id and then stream music as usual.|
|YouTube||One of the more famous spats between Google and Microsoft, this hasn't had an official application for years, though of course it works fine in the Edge browser. I'd recommend myTube!, Perfect Tube or Awesome Tube though, all UWP applications with slick interfaces and all kept bang up to date. Hopefully. YouTube does keep changing things though, so have all three UWP apps installed and go for the one updated most recently (myTube 4.0, as I write this).|
|BBC iPlayer||This has been browser-only for years under Windows phone and Windows 10 Mobile, but it's fine. There's the usual 'log into the BBC servers' and you're in and watching. There's no downloading of programmes for watching later though, for DRM reasons.|
|Third party UWP apps||Curated into a 'best of' list here, new applications have been drying up through 2019 and 2020, with just a handful of new titles each quarter now, though the Flow column on AAWP's front page gives a good idea of which applications are still punching through with any updates.|
Do please let me know, by email or in the comments, if there are any inaccuracies in the above table or if you have information to update it. Thanks.
PS. Another valid question might be what will happen to AAWP itself from 2021 onwards? We've now moved to a cheaper, faster, fresher server, but there are still some bits to do, not least making the site secure (https). And we're going to widen the site family out from AAS and AAWP to include AAM (All About Mobile). But a) do please join the occasional guest writers if you have something to say/review/discuss, email me at email@example.com, and b) well, you know where my tip jar is if you'd like to encourage me (Steve)...(and I keep nagging Rafe to add his own tip jar!)