After restoring Exchange archives some users are timing out expanding folders

We have had to recover from catastrophic disk failure on our Exchange 2010 Mail Stores. After restoring from backups and re-mounting the databases the live mail is working fine, but the archived mail stores seem to have issues.  When some users check their archive using OWA in Chrome and expand a folder, they are getting an error saying "The server operation timed out.  Please try again later."  There were no apparent problems with the backups.

This is happening for some users, but not all.  Has anyone come across this before?
John McDonnellAsked:
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Hypercat (Deb)Commented:
Have you checked to be sure that indexing is (1) enabled for the archive database(s) and (2) working properly for each database?

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Vidit BhardwajAdminCommented:
If you have hard repaired the archive database it is advisory to move all the mailboxes out to new databases, to test this select one archive mailbox of impacted user and move it to different database and see if it has the same issues or not..
SysToolsData Expert - Recovery,Backup,MigrationCommented:
Various Solution can be possible for this Problem :

a) Similar Question asked in Expert Exchange and solution deal with rolling back the.Net update for exchange Try to set Exchange to run with the old version.

https://www.experts-exchange.com/questions/29049389/SBS-on-OWA-The-Server-Operation-Timed-Out.html

b) Please also check whether Symantec Mail Security and please check your Firewall setting.
c) This Error also arise due to RPC Error Timeout: https://technet.microsoft.com/en-us/library/ff360623(v=exchg.140).aspx
John McDonnellAuthor Commented:
Thank you for the comments.  Indexing seems to have sorted this one.
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