Hi Muhammad Akram,
Thank you for posting your question in the Microsoft Q&A forum.
Based on the symptoms you described, I researched a few resources that seem related and may help:
- https://learn.microsoft.com/en-us/exchange/plan-and-deploy/deployment-ref/ms-exch-setupreadiness-rebootpending
- https://www.alitajran.com/a-reboot-from-a-previous-installation-is-pending/
Note: Microsoft is providing this information as a convenience to you. These sites are not controlled by Microsoft, and Microsoft cannot make any representations regarding the quality, safety, or suitability of any software or information found there. Please ensure that you fully understand the risks before using any suggestions from the above link.
If those articles don’t completely match your scenario, you can also download and run Microsoft’s Exchange Health Checker to detect if any RebootPending conditions and other prerequisites before installation: https://microsoft.github.io/CSS-Exchange/Diagnostics/HealthChecker/
I hope this information is helpful. If you have any further questions, please feel free to share more details.
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