Two teams are reporting that Outlook isn't working properly in both the desktop app and the web version. Where would you start troubleshooting?
Anyone else having Outlook issues on desktop and web?
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First, pin down what isn't working. Is it signing in, loading mail, opening folders, or something else? Since both desktop and web are affected, check the Microsoft 365 service health dashboard and compare affected users, mailboxes, and locations before treating it as a desktop install problem.
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Some reports mention being unable to open subfolders, though that may not be the same problem your teams are seeing. Ask a couple of affected users to try the same folder in both versions and note any error message.
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If anyone is using classic Outlook, check the version. Updating from 2605 to 2606 has been reported to help with an Outlook issue, but there are also reports of users still having trouble on 2606. Worth testing, not a guaranteed fix.
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Compare an affected account with an unaffected one, ideally on the same network and in the same browser. Also check whether the problem follows the account to another device. That should help narrow down whether you're looking at a user, device, or wider service issue.
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If it keeps happening, open a Microsoft support case with the affected versions, approximate start time, error messages, and the results from desktop and web. Include whether it affects all folders or only particular ones.
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wobbly!compass:
And if the web version has the same symptoms, a desktop update alone may not explain the whole issue.