IISReset on Exchange 2010/2016: Any downtime?

I need to perform an IISReset on all Exchange 2010 and 2016 servers after updating the Outlook Provider.  Will this cause any outage for users (Outlook, ActiveSync, Webmail)?  Will users have to restart Outlook or any chance databases will fail over?
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Cliff GaliherCommented:
Yes, there will be an interruption. It'll close existing sessions and trigger reauthentication at the very least.
BYSAuthor Commented:
Thanks Cliff, will users have to restart Outlook?  Will they be prompted for a password or will re-authentication occur automatically?
Cliff GaliherCommented:
The honest answer is  "it depends."  It dependd on why you are doing a reset. On whether the machine is domain joined. On what versions of outlook. You will likely see a combination of all three where it appears transparent. Where users get a password prompt. Or where users need to restart outlook. It's a lot of moving parts.
Shaun VermaakTechnical SpecialistCommented:
And if you opt to do it run it with noforce
IISReset /noforce

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William FulksSystems Analyst & WebmasterCommented:
The only users it would affect are those who have Outlook open already. Users checking via phones or something like Webmail won't notice unless they try to check email at the exact moment you run the reset.

As for the Outlook users, like Cliff said it depends. USUALLY, Outlook will just recover itself and keep going. However, if the user's password happens to have expired during the day it may prompt for a login. It also may not update itself (i.e. check for new mail) without some interaction from the user to acknowledge that it couldn't see the server. For the most part, you should be OK. If it causes some massive problem with any users it's most likely because of some pre-existing issues on their machine and not because you restarted the service.

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