Hi,
We are in the middle of a migration from Exchange 2010 to 2013, and they are currently coexisting on the network. We are currently migrating mailbox in batch of 15-20 users and for the first 100 or so, everything was fine, but we encountered an issue and after a few days of troubleshooting, decided to ask for help. So here’s the issue :
Only some user cannot open total control mailbox. Every time the user open their Outlook for the first time, Outlook ask for their credentials for the additional mailbox, and in some cases, the credential windows won’t disappear. The user can send and receive message from his own account, but if the user wants to access the Full Access mailbox added through the EMC mailbox delegation, this message shows up : “Cannot expand the folder. The set of folders cannot be opened. Microsoft exchange is not available. Either there are network problems or the exchange computer is down for maintenance.” . The user can have access to the calendar and the contacts of the attached mailbox but the inbox is unavailable.
Here’s our configuration and what we’ve actually tried to solve this issue :
General configuration :
- All Exchange 2013’s internal and external virtual directory are in the same format : https://ourserverfqdn/ExchangeDirectoryPathofTheVirtualDirectoryORServiceLikeCAS
- Those addresses are different from Exchange 2010
- We have Autodiscover DNS records for both of our Exchange server
- DNS also have the server’s FQDN
- Our users use Office Pro 2010 with the latest updates
- All the mailbox transfers from one Database to the other are clear (no errors)
What we’ve tried up to this point :
- Remove and add back the rights with the ECP
- Tried to remove the access and add them back using PowerShell
- Delete the Outlook profile and create a new one
- Adding the Outlook account directly with the credential in the account parameters
- Adding the Outlook account in the profile advanced settings
- Uninstalling Office, then reinstalling it
- Replacing the actual computer
- This “solution” actually works, with exactly the same specs and Office Pro 2010 updated (only works sometime. All other times, we need to replace Office 2010 with Office 2013 on the new computer). But replacing every user computer with this issue is only a way to avoid the actual issue.
- Uninstalling Office 2010 and go with Office 2013
- This “solution” actually works as well (only sometimes. All other times we need to replace the computer itself), but we do not have enough licence to move every user to this version (due to an program we use, every user with access to it must be on the same Excel/Word/Outlook versions, or else it won’t work, which represents, well, all our users) and to avoid the issue once again.
So as of now, as a temporary measure, users with 1 or 2 Full Access mailbox, have access through the webpage, but some of them have multiple (over 5), and this temporary measure isn’t very effective.
Is there something we missed, or any configuration we could try to resolve this issue ?
Thanks