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BCL-4181 avatar image
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BCL-4181 asked EricYin-MSFT answered

Can Exchange 2019 run well with only 80 Gigs of memory?

Hello all,
Getting ready to install our new exchange server and well.... we only have 80 gigs of memory, not the minimum of 128.
Will it run well or will it crap out due to the lack of memory?
Thanks in advance.

office-exchange-server-administration
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AndyDavid avatar image
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AndyDavid answered BCL-4181 commented

Thats the recommendation, not an absolute requirement:
https://office365itpros.com/2018/09/28/exchange-2019-128gb-minimum/

Clearly, a server handling one hundred mailboxes does not need 128 GB and you only need to equip the server with enough memory to handle the anticipated load. That amount might be 32 GB or 64 GB or 128 GB. It all depends on the load, and Microsoft will continue to provide support to customers who deploy Exchange 2019 on servers equipped with less than 128 GB. However, if you have less than the recommended minimum and you run into performance issues, I think it fair to say that you will not find a sympathetic shoulder to cry on if you call support.

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haha...fair enough.

We have less than 100 mailboxes at the moment.
We'll beef up as time goes on. Thanks, B

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EricYin-MSFT avatar image
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EricYin-MSFT answered

You can use the Exchange Server 2019 Sizing Calculator when planning the configuration, memory calculation is included:
Announcing The Exchange Server 2019 Sizing Calculator
Download Exchange Server 2019 Capacity Calculator



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