TMsvResolverLeave in Messaging MSG

TMsvResolverLeave

Defines error codes that relate to the Message Server.

`KMsvMediaUnavailable`	There is no disk in the drive containing the Message Server index.
`KMsvMediaIncorrect`	There is a disk in the drive containing the Message Server index, but it is the wrong one.
`KMsvMediaChanged`	A `CMsvEntry` context is no longer valid because the location of the Message Server's index has changed. Such contexts will need refreshing by the client.
`KMsvIndexBackup`
`KMsvIndexRestore`

Enum `TMsvResolverLeave`