Load balancing Exchange with HAProxy
During a migration to Exchange Online, our load balancer could not take the extra traffic without a costly upgrade. HAProxy on a small Debian VM did the job: the full configuration.
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Exchange HTTP error 400 and event ID 15021 after a reboot
After a reboot, Exchange returned HTTP 400 and logged event 15021 for 0.0.0.0:444. The Exchange Back End site in IIS had lost its certificate binding.
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Count active mailboxes and distribution groups in Exchange
Exchange Management Shell one-liners that count the active user mailboxes, shared mailboxes and distribution groups in an Exchange 2016 organisation.
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Increase the ActiveSync attachment size limit in Exchange
Exchange limits ActiveSync to about 10 MB by default, so large attachments fail to open on mobile devices. Two values in the Sync web.config raise the limit.
