total number of virtual interfaces allowed on a 506e

As I understand it only two virtual interfaces may be utilized on a 506e.  Currently I have one inside interface.  I would like to add two more interfaces.  The end result being 3 vlan's associated to 3 different interfaces.  When they say 'two virtual interfaces' does that include the default inside interface?  or, does the default inside interface become a virtual once another is created?
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If you look at the following table, you will see that the 506 with an unrestricted license installed will support a total of 4 interfaces...2 physical and 2 logical.

>>When they say 'two virtual interfaces' does that include the default inside interface?

No, it doesn't.  You associate two logical interfaces that you create with the inside or outside interfaces, but you wind up with 2 physical and 2 logical interfaces.  The link above contains a section named "Using VLANs with the Firewall".  Read that section and it should be explained.
Yes, you can have 3 vlans inside for a total of 4 interfaces on 506e

interface ethernet0 auto
interface ethernet1 auto  <== physical interface = vlan1 native untagged
interface ethernet1 vlan2 logical  <= virtual #1
interface ethernet1 vlan3 logical  <= virtual #2

nameif ethernet0 outside security0
nameif ethernet1 inside security100
nameif vlan2 intf2 security4
nameif vlan3 intf3 security6

ip address outside dhcp setroute
ip address inside
ip address intf2
ip address intf3

Switchport that the PIX physical interface plugs into must be a trunk port.

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