I did receive 2 questions from players from my another guide, and since I can't remember the answers, might as well try making a guide for future players.

When you own 10 identical contacts, you will get a puzzle.
When you own 35 identical contacts later, you will get another puzzle.

Puzzles will appear in your mail, there will be a notification sound when the mail arrives.

1st puzzle:
Grandma needs you to find her password(ans: Bubbles)

1st puzzle:
He will send you his remote network drive, go to files 3->5->2 and delete the zip file.

2nd puzzle:
Open "Run" and type in "Find:xxx.zip", you will get the answer. 2->4->6->1->3->5
Open remote network drive from his first email and follow the sequence, then delete his file, again.

1st puzzle:
drag all programs into the recycle bin and you're done.

2nd puzzle:
close the popups and drag all programs into the recycle bin.

1st puzzle:
????? ????? -> hello world

2nd puzzle:
the operand needed is %.

1st puzzle:
Open "Run" and type "Chatbot:Subprocessor:4"
Select all traffic lights and all robots

2nd puzzle:
Open "Run" and type "Chatbot:Subprocessor:64"
Select all humans, babies and click the image once.

1st puzzle:
From the paperclip prog, he reveals support@softcorps.com

2nd puzzle:
Paperclip will hint at CEO's letter, the words are: innovative, synergy, disruptive.

1st puzzle:
Open "Run" and type "webscape:view source". You will find out the solution is admin and root.
Change the number to 99 and save.

2nd puzzle:
Go to the bank, run "webscape:view source". Fill in the first box with "ISNOT" and the second box with "IS".
Fill in the username as "not-reality", and a random password.
Send the code "3P1CG4M35" via email.(Not sure whether the code changes for every run.)

1st puzzle:
Provide grandma's phone number, 555-6362.
Grandma will change her phone number and inform you afterwards.

2nd puzzle:
Provide grandma's phone number, this time it's 555-6274.
Grandma will give you her email.(Important!)

1st puzzle:
find the D.E.'s remote desktop, and copy her IP : 338.356.737.739

2nd puzzle:
Open the remote desktop, and open the recycle bin.

1st puzzle:
the constellation is ursa major.

2nd puzzle:
Run "goatse.cx" and wait.

1st puzzle:
Open the bank and login into not-reality, reply the email with the code "3P1CG4M35", shown in the bank's webpage.

2nd puzzle:
Provide them with grandma's email, grandmaloves@mailsoft.com

Hope this guide helps. Have a nice day.