Many portable computers no longer include a built-in Condenser Microphone (Mic) in their standard specification, even if a Mic seems to be present (a small hole with an image of a microphone or "Mic" beside it normally sited on the upper part of the screen's plastic frame or occasionally on the Control Panel at the foot of the screen, often what seems to be the Mic is actually just a redundant, optional extra facility under which a MIc could be added by the manufacturer if the specification of the computer required one.
Since many computer-based activities that require Mics, such as Conference Calling, Voice Over Internet Protocol (VOIP - voice calls over the internet) Telephony, Gaming, Skype Internet calls (VOIP calls + Webcam), E-Mail Account Voice Calls, Voice Messaging, Karaoke, Music Recording, etc. also tend to require earphones/headphones as well as Mics, a consensus has built around a preference for dedicated headsets with combined Mic and Headphones functions.
To establish whether a built-in Condenser Mic is specified for and installed in this computer (assuming this computer runs a Windows Operating System):
Start -> Accessories -> Entertainment -> Volume Control -> Options -> Properties -> scroll down through the audio-related device list to find "Mic" -> tick "Mic" -> OK -> untick "Mute" at the foot of the "Mic" Panel -> Close Volume Control -> Start -> Accessories -> Entertainment -> Sound Recorder -> click the button with red dot on it to start recording sound via the built-in Condenser Mic -> Speak, clap or generate sounds near the computer -> if a Mic were installed the waveform in the center of the Sound Recorder box would modulate to reflect the sounds you are making -> if no sound registers during test recording, then check for a power up/mute Mic switch on the front or sides of the computer or on the Control Panel or by using a Function Key to toggles the Mic on and off (press and hold Fn + the relevant Audio Input/Mic Function [F+number] key), then repeat the above test recording procedure with another set of sounds.
If any of the devices, switches, Function keys or tools mentioned above is missing or inaccessible on this computer, then the probability is that no built-in Mic is specified for or installed on it.
In any event, in terms of convenience, ease of use, comfort, posture and both inbound and outbound sound quality, by far the best device for a Conference Call is a dedicated headset (see examples and a potential source below):AMAZON - USB Headsetshttp://www.amazon.com/s/ref=nb_sb_ss_c_1_21?url=search-alias%3Delectronics&field-keywords=plantronics+usb+headsets&sprefix=plantronics++headsetsBESTBUY - USB Headsetshttp://www.bestbuy.com/site/searchpage.jsp;jsessionid=DC39D8B9ECA7DEB08D8776E2C1DC08CE.bbolsp-app04-34?_dyncharset=ISO-8859-1&_dynSessConf=-8275865406227367138&id=pcat17071&type=page&st=USB+headset&sc=Global&cp=1&nrp=15&sp=&qp=&list=n&iht=y&usc=All+Categories&ks=960
LIGHT OFFICE USE (Ambient Sound Permitting) USB HEADSETMID WEIGHT EAR-ENCLOSING (Ambient Sound Excluding) USB HEADSET