can vCenter 5.0 (Build 623860) ie Upd 1 manage ESXi 5.1 or 5.0 Upd 2 & ease of upgrade

can vCenter 5.0 (think build 623860 is Update 1) be used to
manage ESXi 5.1 or ESXi 5.0 Upd 2 and deploy their VMs?

What are the limitations/caveats if it can be used?

We accidentally installed ESXi 5.1 into a couple of servers
at a client's site but the client has vCenter 5.0 Build 623860
(this is Upd 1).  However, Ver 5.0 Upd 1 has a bug that during
vMotioning of multiple VMs, unicast traffic could make the
network crawl.
So what's the best option for the client?  Upgrade their current
vCenter 5.0 Upd 1   to  5.0 Upd 2   or  to 5.1 ??
Which is the easiest & can be easily done by an untrained
VMware IT person without the need to buy a 5.1 licence
(or if we're at 5.0, we're entitled to 5.1 ?) ?

What if we need to downgrade the two ESXi hosts from 5.1
to 5.0, what's the steps involved or provide a link with the
instructions to do this
Who is Participating?
Andrew Hancock (VMware vExpert / EE MVE^2)Connect With a Mentor VMware and Virtualization ConsultantCommented:
Q1: You will need to upgrade to vCenter 5.1. vCenter 5.0 and ESXi 5.0, or vCenter 5.1 and 5.0 and 5.1.

vCenter 5.1 and ESXi 5.1 must match
see the VMware Matrix

Q2: not applicable, versions of ESXi and vCenter must be the same or higher, e.g. vCenter 5.1 can manage 5.0 and 5.1, but vCenter 5.0 cannot manage 5.1.

Q3: Upgrade to vCenter 5.1.

Q4. Just insert the CDROM, Boot the server and complete the installation, if using local disks for VMs, it will not overwrite and preserve VMs. BUT it will not Upgrade, it will be a new installation, so configuration, e.g. vSwitches, IP Addresses will be lost!
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