| ▲ | stackskipton 5 hours ago |
| As former Exchange admin/Office365, it's using EWS (Exchange Web Services) which is being removed in October 2026 for Office365. So for most, this is extremely time limited. EDIT: EWS continues to be supported for on premises Exchange and is not scheduled for deprecation. |
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| ▲ | aorth 4 hours ago | parent | next [-] |
| The Thunderbird blog post also mentions they are looking to support the Microsoft Graph. More limiting is that the current release doesn't support custom Office365 tenant IDs. So basically, unless you are using outlook.com this won't currently work yet. I'm lucky that my org hasn't disabled SMTP and IMAP, but it's been so slow lately... |
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| ▲ | bangaladore 4 hours ago | parent [-] | | Someone might be wondering why someone might have different URLs. One example is anyone under sovereign clouds (eg. GCC, GCC-High) which use different URLs (and TLDs) across the board (eg outlook.office365.us) |
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| ▲ | drannex 5 hours ago | parent | prev | next [-] |
| > it's using EWS (Exchange Web Services) which is being removed in October 2026 for Office36 This is Microsoft we're talking about here, so if its slated for removal in Oct '26, it will be put into LTS, and finally 'retired' (but operational) _starting_ around 2031. |
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| ▲ | stackskipton 4 hours ago | parent [-] | | Microsoft swears it's happening: https://techcommunity.microsoft.com/blog/exchange/retirement... Take the blog article for what you will. I have noticed in Office365, they tend to be less backward compatible than you would expect from Microsoft. | | |
| ▲ | godelski 4 hours ago | parent | next [-] | | > Microsoft swears it's happening
And when has that ever meant it comes without delay? | | |
| ▲ | stackskipton 4 hours ago | parent | next [-] | | Up to you if you believe Microsoft or not. I don't really care, I haven't messed with 365 outside being end user in years. | |
| ▲ | dijit 2 hours ago | parent | prev [-] | | to be fair with you, EWS has been deprecated since I think 2014, so we're already in the "pushed" window. |
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| ▲ | ocdtrekkie 4 hours ago | parent | prev [-] | | As an on-prem admin, I am blown away that there's 30-40 changes to 365 monthly, often including at least two or three feature deprecations. It seems like building a building on top of quicksand. |
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| ▲ | amaccuish 5 hours ago | parent | prev | next [-] |
| As you imply though, it remains for on-premise. They're working on msgraph as well luckily. |
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| ▲ | stackskipton 4 hours ago | parent [-] | | I updated my post to reflect yes, this is Office365 only. On premise will continue to support EWS. Depending on where you are, Exchange on premise is becoming extinct. |
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| ▲ | trympet 5 hours ago | parent | prev [-] |
| How do you know Thunderbird is using EWS, not MAPI? MAPI is not going away any time soon. |
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