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We plan to move our Kerio Connect server (ESX 5.1 linux host) to a new host. Kerio mail store is about 1To, +/- 300 users.

What Kerio does recommend for such configuration ? Moving our host to a windows server (which version to avoid ?) or moving it to a linux server (which version, file system ?).

We wan't to do this because our users are complaining about slowdown on both webmail client and outlook client !

[Updated on: Tue, 24 March 2015 10:30]


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I have migrated 3 years ago my kerio from windows to linux.

I had about 100 users, the server was a windows windows server 2003 R2 with 2 cpu and 4gb of ram, resources were always at max and often the server crashed.

The new installation was done on Ubuntu 12.04 LTS, with 2 CPU and 3GB of RAM, the maximum cpu committed itself never rose more than 5% and the ram over 25%.

Now I recently reinstalled a new server with ubuntu 14.04 LTS and the same hardware features, my users have increased but the performance of the servers are always very low

Based on my personal experience I can recommend Linux

[Updated on: Tue, 24 March 2015 14:46]


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Very nice test. Was the Linux installed on the 2003 box or was it a newer box with newer/faster/more core processors? Confused

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My infrastucture (VmWare) was the same. Only upgrade from VmWare 4.5 to VmWare 5.1 but the hardware was the same
Vicky Tripp (Kerio)

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Hi Stephane,

Connect does tend to run smoother on a Linux platform as Linux is normally less CPU/memory hungry as an operating system and is just more efficient. I would recommend going to Linux and either sticking with the Kerio Appliance or going with Ubuntu if you are new Linux. I find that Ubuntu is very user friendly and easy to start off with.

All the best,

Vicky Tripp
Kerio Technical Support Engineer
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