I have an Exchnage environent with many domains and many mailboxes on each domain.
I have a ceratin mailbox that has over 5.6k contacts in it.
When trying to sync it to an Android phone, It only synced about 4.9k of them, futhermore, after reaching the peak of 4.9k contacts, it starts dropiing.
I tried it on two different phones, on two different Android versions. both Kitkat and Lolipop, and on both the same issues happens.
I also tried the builtin app an several external apps that all showed the same thing. I check the issue on an iPhone and I couldn't reproduce the issue.
Has anyone encountered such an issue?