We are using Dynamics CRM 8.0 (On-Premise) with Server-Side Synchronization to sync emails from an O365 mailbox to a CRM Email Queue. However, we are facing frequent delays in email synchronization, causing operational inefficiencies.
Observations & Issues:
- Emails are not syncing in real-time – We see delays in email synchronization from O365 to the CRM queue.
- No suspicious errors in logs – Despite checking CRM logs, we haven’t found any obvious issues indicating failures.
- BulkDelete job causing timeouts? – We have observed that the BulkDelete process sometimes experiences timeouts, but we are unsure whether this is impacting the Microsoft Dynamics Async Processing Service.
- Manual restart of Async Processing Service helps – When we restart the Microsoft Dynamics Async Processing Service, emails start syncing immediately. This suggests that something is blocking or delaying the sync process.
- High response load when emails sync together – Since emails are getting queued and arriving all at once after a restart, this increases the workload for our team, leading to delays in processing responses.
- O365 Mailbox reaching storage limits – The O365 mailbox has reached 95% of its storage capacity, which we are addressing by deleting old emails and optimizing storage. However, we are unsure if this is related to the sync delay.
Request for Help:
- How can we identify the exact cause of these email sync delays?
- Does the BulkDelete process impact the Async Processing Service and email sync?
- Are there CRM or O365 settings/logs that can help pinpoint why emails are not syncing in real-time?
- Would optimizing storage in O365 resolve the issue, or should we look at CRM-side optimizations?
- Any recommendations for troubleshooting or improving sync performance?
Any insights or suggestions would be greatly appreciated.

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