Not sure if there is a limit or a bad handling within TMSPE.
1000 is a typical ldap limitation regards answering on a single request, but normaly
clients could ask for more, ...
What version is your AD?
As a workaround you could use different groups, it might be handy anyhow to have some seperation of your users.
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Can you explain what causes the 10K limit on imported users? We have a robust SQL Server cluster and seemingly TMS and TMSPE are equally robust. We're quite surprised to realize this 10K folder limitation. We have over 130K users and trying to manage who gets to download Jabber is going to be a nightmare. What causes the 10K limitation? WEre' running TMS14.3.1 and TMSPE 1.1.
See page 71 in the TMSPE Deployment doc:
The limitation is on the VCS db side, i.e. exceeding internal table limits.
See page 23 of the same doc on what we recommend concerning grouping your users. And also see page 12 concerning VCS cluster limitations as well.
In your case, and based on the numbers your talking and the solution limits, you could have 10 groups containing 10k users each associated to 10 VCS clusters, i.e. 100k.