RDP Outlook Exchange Accounts

Hello Experts,

I have an issue which is getting worse, about six months ago we deployed a Windows 2016 RDP Server for approx 20 users, the Server is hosted on an ESXI system and the Server provides desktop access to their main application and office 2016 which includes Outlook 2016 with Exchange accounts to an offsite, Exchange Server in the cloud hosted by another company.

Some RDP profiles have the same Exchange accounts so a number of users will send receive using the same email account. Recently users have been experiencing a prolonged period when openening Outlook and for some users Outlook will fail to open and will complain that its unable to access the folders, if I "taskkill" all the outlook processes on the Server it will allow everyone to connect to their mailboxes.  Also when this issue occurs I can always OWA into the same email account from the RDP desktop so the hosted Exchange Server is still accepting connections. My gut feeling is that the issue maybe because all profiles are running in "online" mode which is default for RDP Servers, but its causing performance issues because the Exchange Server is offsite. I'm considering changing some of the shared accounts  to "cached mode" to see if this alleviates some of the burden, any suggestions please?
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Jeff GloverSr. Systems AdministratorCommented:
Do the outlook profiles have Cached mode enabled? (this is default with newer Outlook versions. You have to turn it off specifically) If so, one account may be locking the OST file needed with Cached mode. For RDP profiles, Cached mode should be disabled. It serves no purpose there.

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William FulksSystems Analyst & WebmasterCommented:
Just curious, why are multiple users sharing Exchange accounts? Seems like you've created your own problem doing this. If you want people to access the same emails, create group email addresses and/or set up forwarding rules.
markfureyAuthor Commented:
Hello Ivjeff, the accounts have cached mode disabled which I believed was the default for all outlook versions on and RDP Server?

We don’t have access to the Exchange Server its supported by another company but good a suggestion though, the point I'm trying to clear up is should an RDP Server with running of Exchange accounts to an offsite, hosted Server be running in cached/online mode?
Jeff GloverSr. Systems AdministratorCommented:
We would never run Cached mode on an RDP server. Cached mode is mainly for when you travel and cannot connect to the Exchange server. Hosted or on prem should make no difference
William FulksSystems Analyst & WebmasterCommented:
Jeff Glover offered the best config advice to answer the question.
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