I have an organization with Exchange 2013 servers at three sites running a DAG. Latency between sites 1 and 2 is about 1-2ms, and latency between either site and site 3 is 25-35 ms. get-exchangeserver shows all three servers using the DC at site 2. we have been noticing serious delays in replication when settings change- for example, 2 weeks ago we removed a delegation setting from a mailbox, and one of the users still has the access while the other does not. Sometimes settings take a few days to go through. Any idea where I should look for the cause of this? I haven't noticed anything abnormal in the event logs. The only change I made recently was this morning where I removed Hyper-V time sync from the guest services for the DC, which was causing a 3-minute time difference between sites- well within the 5 minute SSL/Kerberos 'skew' limit. Let me know- I appreciate any suggestions!