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Centralised Citrix with Outlook 365 and Distributed Exchange servers


Lee Osborne1709161955

Question

We're currently redesigning our XenApp infrastructure and having mixed conversations and suggestions with regards to Outlook 365 with OST files.

 

We have a primary (EMEA) datacenter with our XenApp 7 1909 infrastructure and users from across Europe connecting into this for published apps and published desktops, with Outlook 365 being one of the applications. Each office has local Exchange with users mailboxes for that office. When the user logs onto Citrix in the datacenter, the mailbox is accessed over the internal WAN.

 

Until now, we've used Outlook 2010 in Online (non-cached) mode and everything has worked as expected. Now we're moving to Outlook 365, a number of our addins don't support Online mode and we need to move to Cached Mode. 

 

We've tried limiting the number of days of mail to download to 3 days and the users have expressed negative feedback with this, and even then it's a 500MB OST. We'd go with a mostly unsupported option of storing the OST on a shared drive via UNC or mapped drive to manage the excess disk space, but the OST is still going to be dragging GBs and TBs of mail across the WAN to populate the OST files. At peak logon times, this will kill the WAN and the users logon times.

 

If we don't roam the OST file, the users logs off and the OST file disappears as it's in the Local AppData. The next time they logon (highly likely to a different server) the OST file is recreated again. Regardless of that, the mail is still being dragged across the WAN when Outlook is loaded.

 

Citrix UPM or FSLogix would be an option, but the problem still comes back to the OST in the datacenter pulling the mail from an Exchange server over the WAN.

 

Is anyone else doing something differently or have any suggestions?

 

 

Windows Server 2019

Citrix Virtual Apps and Desktops 1909 (Premium) in a central datacenter

Exchange 2013 (all on-prem., in every global office)

Outlook 365 CTR

 

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This really is no different than if you were moving to exchange online...reality is, if you are forced to use cached mode, at some point in time you are going to have to **** that mail content down into an OST file, but this can be controlled and staged....

 

Use FSLogix Office Container, its the most robust solution for this sort of thing, and then control the amount of mail (3-6-12 months) you pull in stages if you are doing a bulk cutover OR just selectively stage your user base over to cached mode so that you don't have a gigantic storm

 

There is no way to escape pulling that mail over once, but it's really not that big a deal if you have containers supporting you, it's just a shame in your situation that you have to enable cached mode given you have on prem exchange

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8 hours ago, James Kindon said:

This really is no different than if you were moving to exchange online...reality is, if you are forced to use cached mode, at some point in time you are going to have to **** that mail content down into an OST file, but this can be controlled and staged....

 

Use FSLogix Office Container, its the most robust solution for this sort of thing, and then control the amount of mail (3-6-12 months) you pull in stages if you are doing a bulk cutover OR just selectively stage your user base over to cached mode so that you don't have a gigantic storm

 

There is no way to escape pulling that mail over once, but it's really not that big a deal if you have containers supporting you, it's just a shame in your situation that you have to enable cached mode given you have on prem exchange

 

James, thanks for the reply. You've pretty much confirmed what I expected amd I'll look into FSLogix Office Container as this sounds like it might the best option.

 

Online Mode works perfectly for us at the moment and would be our preferred option going forward but unfortunately we're no longer in a position to do this.

 

I'll leave the thread open a little longer and then mark it answered unless anyone has any other bright ideas, although I think the options are now exhausted!

 

Lee

 

 

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