This is one of my favourite moments from The Office. Very well written song by very talented musician Creed Bratton. 
I've fixed the errors found on UG's tab by listening to the live version of the song(Video above). I was actually shaking from excitement(at 12AM) when I decided to improve on a current tab; it really feels like a milestone to be able to tab this song correctly. I don't think I'll be able to fall asleep anytime soon.
Note: May be subject to more change/correction.

Std Tuning, no capo
   D                                               G
E|--------2--------------|--------2--------------|--------3----------------|--------------|
B|--3-----------3-----3--|--3-----------3-----3--|--0-----------0h1-----0--|--3--5/7--10--|
G|-----2-----2-----2-----|-----4-----4-----4-----|-----0-----0-------0-----|--------------|
D|--0--------------------|-----------------------|-------------------------|--0--0----0---|
A|--------------4-----0--|--2-----------2-----0--|-------------------------|--------------|
E|-----------------------|-----------------------|--3-----------3-------3--|--------------|

   D                        E?                         G?
E|-----------2-------2----|-----------0--------0-----|--------0-------------0--------2h3--2--|
B|--3-----3-----3---------|--0-----0-----0-----------|--0-----------0-------0-----3----------|
G|-----2----------2-------|-----1-----------1--------|-----1-----1-------0-----0-------------|
D|--0--------0-------0----|--0--------0--------0-----|----------------------------0----------|
A|------------------------|--------------------------|--2-------------------2----------------|
E|------------------------|--------------------------|--------------0h3----------------------|

Verse 1(Repeat Intro)
         I saw a friend today, it had been a while.  
   D                                                 
E|--------2---------------|--------2----------------|
B|--3-----------3-----3---|--3-----------3-----3----|
G|-----2-----2-----2------|-----4-----4-----4-------|
D|--0---------------------|-------------------------|
A|--------------4-----0---|--2-----------2-----0----|
E|------------------------|-------------------------|

     We forgot each other's names...
   G                           D           Dsus
E|--------3----------------|--------2-----2h3--2--|
B|--0-----------0-------0--|--3-------------------|
G|-----0-----0-------0-----|-----2-----2----------|
D|-------------------------|--0-------------------|
A|-------------------------|----------------------|
E|--3-----------3-------3--|----------------------|


         But it didn't matter because...
   D                        E?                         G?
E|-----------2-------2----|-----------0--------0-----|--------0-------------0--------3--2----|
B|--3-----3-----3---------|--0-----0-----0-----------|--0-----------0-------0-----3----------|
G|-----2----------2-------|-----1-----------1--------|-----1-----1-------0-----0-------------|
D|--0--------0-------0----|--0--------0--------0-----|----------------------------0----------|
A|------------------------|--------------------------|--2-------------------2----------------|
E|------------------------|--------------------------|--------------0h3----------------------|