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===SME 9===
===SME 9===
{{Note box|msg=In-place upgrades to SME 9.2 *are* supported - from 9.# only. # yum upgrade, see note below for caveats.}}
{{Note box|msg=In-place upgrades to SME 9.2 *are* supported - from 9.# only. # yum update, see note below for caveats.}}
{{Note box|Although a yum upgrade should return a working updated server, to be 100% sure, you are advised to only upgrade clean machines, e.g. without contribs or other modifications.}}
{{Note box|Although a yum update should return a working updated server, to be 100% sure, you are advised to only upgrade clean machines, e.g. without contribs or other modifications.
yum upgrade forces the removal of obsolete packages, while yum update may or may not also do this. The removal of obsolete packages can be risky, as it may remove packages that you use.
This makes yum update the safer option..}}
====DVD/CD====
====DVD/CD====
