MacOS – Which Macs cannot upgrade to Mountain Lion

Apple said the following Macs will run Mountain Lion:

• iMac (Mid 2007 or newer)
• MacBook (Late 2008 Aluminum, or Early 2009 or newer)
• MacBook Pro (Mid/Late 2007 or newer)
• MacBook Air (Late 2008 or newer)
• Mac mini (Early 2009 or newer)
• Mac Pro (Early 2008 or newer)
• Xserve (Early 2009)

So the complement of this list are not supported to run Mountain Lion (as far as I can tell; edit this list to add or subtract models as appropriate; you may be able to get it running on an unsupported machine):

• Macintosh 128K

• Macintosh 512K

• Macintosh 128K (revised)

• Macintosh XL

• Macintosh Plus

• Macintosh 512Ke

• Macintosh Plus (Platinum)

• Macintosh SE

• Macintosh II

• Macintosh IIx

• Macintosh SE/30

• Macintosh IIcx

• Macintosh SE FDHD

• Macintosh IIci

• Macintosh Portable

• Macintosh IIfx

• Macintosh LC

• Macintosh Classic

• Macintosh IIsi

• Macintosh Portable (backlit screen)

• Macintosh Classic II

• Quadra 700

• Quadra 900

• PowerBook 100

• PowerBook 140

• PowerBook 170

• Macintosh LC II

• Quadra 950

• PowerBook 145

• Macintosh IIvi

• Macintosh IIvx

• PowerBook 160

• PowerBook 180

• PowerBook Duo 210

• PowerBook Duo 230

• Macintosh LC III / III+

• Macintosh Color Classic

• Centris 610

• Centris 650

• Quadra 800

• PowerBook 165c

• Workgroup Server 80

• Workgroup Server 95

• PowerBook 145b

• PowerBook 180c

• Macintosh LC 520

• Workgroup Server 60

• Centris / Quadra 660AV

• Quadra 840AV

• PowerBook 165

• Macintosh Color Classic II

• Macintosh TV

• Quadra 605

• Quadra 610

• Quadra 650

• PowerBook Duo 250

• PowerBook Duo 270c

• Macintosh LC 550

• Macintosh LC 575

• Power Macintosh 6100

• Power Macintosh 7100

• Power Macintosh 8100

• Workgroup Server 6150

• Workgroup Server 8150

• Workgroup Server 9150

• PowerBook 520/c

• PowerBook 540/c

• PowerBook 550

• PowerBook Duo 280

• PowerBook Duo 280c

• Quadra 630

• PowerBook 150

• Power Macintosh 6200 / 6300

• Macintosh LC 580

• Performa 5200

• Power Macintosh 9500

• Power Macintosh 7200

• Power Macintosh 7500

• Power Macintosh 8500

• PowerBook 190

• PowerBook 5300

• PowerBook Duo 2300c

• Workgroup Server 7250

• Workgroup Server 8550

• Performa 5260 / 5300

• Performa 5400

• Power Macintosh 7600

• Performa 6360

• Performa 6400

• Power Macintosh 4400

• PowerBook 1400

• Power Macintosh 5500

• Power Macintosh 6500

• Power Macintosh 7300

• Power Macintosh 8600

• Power Macintosh 9600

• PowerBook 3400

• Twentieth Anniversary Macintosh

• Workgroup Server 7350

• Workgroup Server 9650

• PowerBook 2400c

• Power Macintosh G3 desktop

• Power Macintosh G3 minitower

• PowerBook G3

• Power Macintosh G3 AIO

• Macintosh Server G3

• PowerBook G3 series

• iMac G3

• Power Macintosh G3 (Blue & White)

• Macintosh Server G3 (Blue & White)

• PowerBook G3 ("Lombard")

• iBook

• Macintosh Server G4

• iMac (slot loading)

• Power Mac G4 Graphite

• PowerBook ("Pismo")

• Power Mac G4 Cube

• iBook (FireWire)

• PowerBook G4 Titanium

• iBook (white)

• Power Mac G4 Quicksilver

• Server G4 Quicksilver

• iMac G4 15"

• iBook (14")

• eMac

• Xserve

• iMac G4 17"

• Power Mac G4 MDD

• Macintosh Server G4 MDD

• PowerBook G4 Aluminum (12")

• PowerBook G4 Aluminum (17")

• Xserve slot loading

• Xserve Cluster Node

• Power Mac G5

• PowerBook G4 Aluminum (15")

• iBook G4 (12" / 14")

• iMac G4 20"

• Xserve G5

• Xserve Cluster Node G5 Xserve

• Power Mac G5 FX

• iMac G5 17"

• iMac G5 20" iMac

• Mac mini

• Power Mac G5 dual core

• iMac Core Duo

• MacBook Pro (15")

• Mac mini Core Solo

• Mac mini Core Duo

• MacBook Pro (17")

• MacBook (Late 2008 plastic)

• Xserve (Intel) (Late 2006)

• MacBook (Late 2006)

• Mac mini Core 2 Duo

• MacBook (Late 2007)

• Xserve Harpertown

• MacBook Penryn

• 1st generation MacBook Air (early 2008)